Denial of service in Asterisk
| Risk | Medium |
| Patch available | YES |
| Number of vulnerabilities | 1 |
| CVE-ID | CVE-2018-17281 |
| CWE-ID | CWE-121 |
| Exploitation vector | Network |
| Public exploit | N/A |
| Vulnerable software Subscribe |
Certified Asterisk Server applications / Conferencing, Collaboration and VoIP solutions Asterisk Open Source Server applications / Conferencing, Collaboration and VoIP solutions |
| Vendor | Digium (Linux Support Services) |
Security Bulletin
This security bulletin contains one medium risk vulnerability.
1) Stack-based buffer overflow
EUVDB-ID: #VU14912
Risk: Medium
CVSSv3.1: 6.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]
CVE-ID: CVE-2018-17281
CWE-ID:
CWE-121 - Stack-based buffer overflow
Exploit availability: No
DescriptionThe vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to a boundary error when processing HTTP requests within "res_http_websocket.so" module. A remote unauthenticated attacker can send a specially crafted HTTP request that triggers an HTTP websocket upgrade, causes stack overflow and consumes all available stack memory on the system.
Successful exploitation of this vulnerability may result in denial of service attack.
Mitigation
Install updates from vendor's website.
Vulnerable software versionsCertified Asterisk: 13.21-cert1 - 13.21-cert2
Asterisk Open Source: 13.0.0 - 15.6.0
External linkshttp://downloads.asterisk.org/pub/security/AST-2018-009.html
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
